Spastic paraplegia 4 (SPG4; also known as SPAST-HSP) is characterised by insidiously progressive bilateral lower-limb gait spasticity. Much more than 50% of affected persons have some weakness while in the legs and impaired vibration sense for the ankles.???? ??? ? ?? ??: ??? ??? ???? ???? ??? ? ????.A variant of ependymoma, frequently located in t